Effect of direct injection dimethyl ether on the micro-flame ignited (MFI) hybrid combustion and emission characteristics of a 4-stroke gasoline engine
Effect of direct injection dimethyl ether on the micro-flame ignited (MFI) hybrid combustion and emission characteristics of a 4-stroke gasoline engine
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直喷二甲醚对四冲程汽油机微火焰点火（MFI）混合燃烧和排放特性的影响
DOI：
10.1016/j.fuproc.2017.08.001
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发表时间：
2017-12
影响因子：
7.5
通讯作者：
Zhao Hua
中科院分区：
文献类型：
--
作者：
Fu Xue-Qing;He Bang-Quan;Li Hong-Tao;Chen Tao;Xu Si-Peng;Zhao Hua
低温燃烧是内燃汽油机提高热效率和降低NOx排放的必要条件。汽油控制自燃（CAI）技术是实现低温燃烧的一种重要手段，但其对燃烧过程的控制不足限制了其应用。为了克服这一问题，二甲醚（DME）被直接喷射到气缸内产生多个微火焰点火点，并调节预混汽油混合气的整体放热。在一台四冲程汽油机上实现了微火焰点火（MFI）混合燃烧。结果表明，放热过程分为三个阶段：第一阶段为低温氧化反应，第二阶段为DME的高温反应，第三阶段为预混汽油混合气的主燃烧。随着二甲醚后期喷射量的增加，单次喷射和分次喷射的主燃烧开始提前，燃烧持续期缩短，HC和CO排放降低。引入分开的二甲醚喷射可以改善燃烧过程，减少HC和CO排放以及最大热效率。
The low temperature combustion is required for an internal combustion gasoline engine to achieve higher thermal efficiency and lower NOx emissions. The gasoline controlled auto-ignition (CAI) has been extensively researched to achieve low temperature combustion but its lack of control in combustion process has limited its applications. To overcome this problem, dimethyl ether (DME) is directly injected into the cylinder to generate multiple micro-flame ignition sites and regulate the entire heat release of premixed gasoline mixture. This micro-flame ignited (MFI) hybrid combustion was achieved in a 4-stroke gasoline engine in this work. The results show that the heat release process consists of three stages: stage I of low temperature oxidation reactions, followed with a short delay of a few crank angles by stage II of high temperature reactions of DME and the main combustion of premixed gasoline mixture in stage III. With the increased amount of DME in the late injection, the start of main combustion advances and the combustion duration reduces for both single and split injections, which results in lower HC and CO emissions. The introduction of split DME injections improves the combustion process and reduces HC and CO emissions as well as the maximum thermal efficiency.
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